The housing crisis is spurring pro-development arguments that threaten to hasten the "Manhattanization of San Francisco," a buzzphrase from another era that led to local controls on high-rise development.

The city is getting richer and less diverse, and the unaddressed displacement of longtime residents has fueled populist outrage. Now, politicians are finally getting the message, but some are offering solutions that may reopen old civic wounds.

They say that the answer to the housing affordability crisis is to build massive amounts of new housing, and to build it higher and more densely than city codes and processes currently allow.

Sup. Scott Wiener wrote a scathing indictment of the city's alleged aversion to housing production in the San Francisco Chronicle on Jan. 13, slamming a planning process that he says slows necessary construction.

"This disconnect — saying that we need more housing while arbitrarily finding reasons to kill or water down projects that provide that housing — is having profound effects on our city and its beautiful diversity, economic and otherwise," Wiener wrote.

Though he mentioned affordable housing, the need to build all kinds of housing was the crux of his argument. It's the same kind of developer-friendly rhetoric that whips people into a frenzy with faux common sense: build more, and the market will take care of everyone.

But there are flaws to that simplistic argument. Housing advocates (and Guardian editorials) have long argued that market rate units — the median price of which just surpassed $1 million — don't trickle down to maintain the city's economic diversity. More supply may help, but with insatiable demand for housing here, it won't help much with affordability for the working class.

The next day, Wiener introduced legislation to loosen density requirements when developers build below-market-rate housing units on site, creating an incentive to build more of the units that affordable housing advocates say are most valuable.

"Long term, I'm concerned about young persons that can come here," he told the Guardian. "It's not just about building more housing."

But Peter Cohen, co-director of the Council of Community Housing Organizations, says supply and demand logic doesn't apply to the San Francisco housing market for a number of reasons.

He pointed to a paper by CCHO cohort Calvin Welch, who teaches a class on the politics of housing development at USF and SFSU. Welch cites data from the City Controller's Office showing that when San Francisco increases supply, the market responds by raising the average housing price. Contrary to all the supply and demand claims, when we produce more, things get more expensive.

Why?

"In classic economic theory prices are set by supply and demand only when the market is 'competitive' when neither consumers nor suppliers have the 'market power' to set the price by themselves," Welch wrote. "Clearly, that is not the case in San Francisco...of the City's 47 square miles, only 13 square miles is available for housing uses."

"There is no 'free land' in San Francisco," he wrote. "The owners have total 'market power' over its price."